The global site of the UK's leading magazine for automation, motion engineering and power transmission
20 July, 2018

Product and Supplier Search

Facebook

Motor controllers offer a choice of starting and stopping modes

01 February, 2013

Rockwell Automation has announced a new-generation of electronic motor controllers and soft-starts with improved voltage outputs to maximise the efficiency of motor starts and stops.

The Allen-Bradley SMC-50 Smart Motor Controllers are said to offer a more economical alternative to variable speed drives, and more advanced control than direct-on-line starters.

The controllers (above), which incorporate a newly designed three-phase SCR (silicon-controlled rectifier) power structure, combine advanced monitoring and protection functions, multiple start and stop options, and expandable control inputs and outputs. These can help users to raise efficiency, cut downtime and improve control.

There are nine standard starting modes, six stopping modes and several slow-speed functions. In the traditional starting mode, for example, if the device senses that a motor has reached full speed before completing the selected ramp time, it will switch automatically to providing full voltage to the motor. A patented linear acceleration starting mode is said to offer the lowest starting current profile per start, consistent acceleration times and enhanced control over both torque and speed. For all modes, the controller stores the motor start time and peak current value to help optimise set-ups and performance.

An automatic zero-speed shut-off function can stop a motor quickly without needing extra hardware or feedback devices.




Magazine
  • To view a digital copy of the latest issue of Drives & Controls, click here.

    To visit the digital library of past issues, click here

    To subscribe to the magazine, click here

    To see the latest Products & Services Directory, click here

     

Exhibition

Birmingham 2020The next Drives & Controls Exhibition and Conference will take place in Birmingham, UK, from 21-23 April, 2020. For more information on the event, visit the Show Web site

Poll

"Do you think that robots create or destroy jobs?"

Newsletter
Newsletter

Events

Most Read Articles